net/rds/ib.h

   1 #ifndef _RDS_IB_H
   2 #define _RDS_IB_H
   3
   4 #include <rdma/ib_verbs.h>
   5 #include <rdma/rdma_cm.h>
   6 #include <linux/interrupt.h>
   7 #include <linux/pci.h>
   8 #include <linux/slab.h>
   9 #include "rds.h"
  10 #include "rdma_transport.h"
  11
  12 #define RDS_FMR_SIZE                    256
  13 #define RDS_FMR_POOL_SIZE               8192
  14
  15 #define RDS_IB_MAX_SGE                  8
  16 #define RDS_IB_RECV_SGE                 2
  17
  18 #define RDS_IB_DEFAULT_RECV_WR          1024
  19 #define RDS_IB_DEFAULT_SEND_WR          256
  20
  21 #define RDS_IB_DEFAULT_RETRY_COUNT      2
  22
  23 #define RDS_IB_SUPPORTED_PROTOCOLS      0x00000003      /* minor versions supported */
  24
  25 #define RDS_IB_RECYCLE_BATCH_COUNT      32
  26
  27 extern struct rw_semaphore rds_ib_devices_lock;
  28 extern struct list_head rds_ib_devices;
  29
  30 /*
  31  * IB posts RDS_FRAG_SIZE fragments of pages to the receive queues to
  32  * try and minimize the amount of memory tied up both the device and
  33  * socket receive queues.
  34  */
  35 struct rds_page_frag {
  36         struct list_head        f_item;
  37         struct list_head        f_cache_entry;
  38         struct scatterlist      f_sg;
  39 };
  40
  41 struct rds_ib_incoming {
  42         struct list_head        ii_frags;
  43         struct list_head        ii_cache_entry;
  44         struct rds_incoming     ii_inc;
  45 };
  46
  47 struct rds_ib_cache_head {
  48         struct list_head *first;
  49         unsigned long count;
  50 };
  51
  52 struct rds_ib_refill_cache {
  53         struct rds_ib_cache_head __percpu *percpu;
  54         struct list_head         *xfer;
  55         struct list_head         *ready;
  56 };
  57
  58 struct rds_ib_connect_private {
  59         /* Add new fields at the end, and don't permute existing fields. */
  60         __be32                  dp_saddr;
  61         __be32                  dp_daddr;
  62         u8                      dp_protocol_major;
  63         u8                      dp_protocol_minor;
  64         __be16                  dp_protocol_minor_mask; /* bitmask */
  65         __be32                  dp_reserved1;
  66         __be64                  dp_ack_seq;
  67         __be32                  dp_credit;              /* non-zero enables flow ctl */
  68 };
  69
  70 struct rds_ib_send_work {
  71         void                    *s_op;
  72         union {
  73                 struct ib_send_wr       s_wr;
  74                 struct ib_rdma_wr       s_rdma_wr;
  75                 struct ib_atomic_wr     s_atomic_wr;
  76         };
  77         struct ib_sge           s_sge[RDS_IB_MAX_SGE];
  78         unsigned long           s_queued;
  79 };
  80
  81 struct rds_ib_recv_work {
  82         struct rds_ib_incoming  *r_ibinc;
  83         struct rds_page_frag    *r_frag;
  84         struct ib_recv_wr       r_wr;
  85         struct ib_sge           r_sge[2];
  86 };
  87
  88 struct rds_ib_work_ring {
  89         u32             w_nr;
  90         u32             w_alloc_ptr;
  91         u32             w_alloc_ctr;
  92         u32             w_free_ptr;
  93         atomic_t        w_free_ctr;
  94 };
  95
  96 struct rds_ib_device;
  97
  98 struct rds_ib_connection {
  99
 100         struct list_head        ib_node;
 101         struct rds_ib_device    *rds_ibdev;
 102         struct rds_connection   *conn;
 103
 104         /* alphabet soup, IBTA style */
 105         struct rdma_cm_id       *i_cm_id;
 106         struct ib_pd            *i_pd;
 107         struct ib_cq            *i_send_cq;
 108         struct ib_cq            *i_recv_cq;
 109
 110         /* tx */
 111         struct rds_ib_work_ring i_send_ring;
 112         struct rm_data_op       *i_data_op;
 113         struct rds_header       *i_send_hdrs;
 114         u64                     i_send_hdrs_dma;
 115         struct rds_ib_send_work *i_sends;
 116         atomic_t                i_signaled_sends;
 117
 118         /* rx */
 119         struct tasklet_struct   i_recv_tasklet;
 120         struct mutex            i_recv_mutex;
 121         struct rds_ib_work_ring i_recv_ring;
 122         struct rds_ib_incoming  *i_ibinc;
 123         u32                     i_recv_data_rem;
 124         struct rds_header       *i_recv_hdrs;
 125         u64                     i_recv_hdrs_dma;
 126         struct rds_ib_recv_work *i_recvs;
 127         u64                     i_ack_recv;     /* last ACK received */
 128         struct rds_ib_refill_cache i_cache_incs;
 129         struct rds_ib_refill_cache i_cache_frags;
 130
 131         /* sending acks */
 132         unsigned long           i_ack_flags;
 133 #ifdef KERNEL_HAS_ATOMIC64
 134         atomic64_t              i_ack_next;     /* next ACK to send */
 135 #else
 136         spinlock_t              i_ack_lock;     /* protect i_ack_next */
 137         u64                     i_ack_next;     /* next ACK to send */
 138 #endif
 139         struct rds_header       *i_ack;
 140         struct ib_send_wr       i_ack_wr;
 141         struct ib_sge           i_ack_sge;
 142         u64                     i_ack_dma;
 143         unsigned long           i_ack_queued;
 144
 145         /* Flow control related information
 146          *
 147          * Our algorithm uses a pair variables that we need to access
 148          * atomically - one for the send credits, and one posted
 149          * recv credits we need to transfer to remote.
 150          * Rather than protect them using a slow spinlock, we put both into
 151          * a single atomic_t and update it using cmpxchg
 152          */
 153         atomic_t                i_credits;
 154
 155         /* Protocol version specific information */
 156         unsigned int            i_flowctl:1;    /* enable/disable flow ctl */
 157
 158         /* Batched completions */
 159         unsigned int            i_unsignaled_wrs;
 160 };
 161
 162 /* This assumes that atomic_t is at least 32 bits */
 163 #define IB_GET_SEND_CREDITS(v)  ((v) & 0xffff)
 164 #define IB_GET_POST_CREDITS(v)  ((v) >> 16)
 165 #define IB_SET_SEND_CREDITS(v)  ((v) & 0xffff)
 166 #define IB_SET_POST_CREDITS(v)  ((v) << 16)
 167
 168 struct rds_ib_ipaddr {
 169         struct list_head        list;
 170         __be32                  ipaddr;
 171 };
 172
 173 struct rds_ib_device {
 174         struct list_head        list;
 175         struct list_head        ipaddr_list;
 176         struct list_head        conn_list;
 177         struct ib_device        *dev;
 178         struct ib_pd            *pd;
 179         struct rds_ib_mr_pool   *mr_pool;
 180         unsigned int            fmr_max_remaps;
 181         unsigned int            max_fmrs;
 182         int                     max_sge;
 183         unsigned int            max_wrs;
 184         unsigned int            max_initiator_depth;
 185         unsigned int            max_responder_resources;
 186         spinlock_t              spinlock;       /* protect the above */
 187         atomic_t                refcount;
 188         struct work_struct      free_work;
 189 };
 190
 191 #define ibdev_to_node(ibdev) dev_to_node(ibdev->dma_device)
 192 #define rdsibdev_to_node(rdsibdev) ibdev_to_node(rdsibdev->dev)
 193
 194 /* bits for i_ack_flags */
 195 #define IB_ACK_IN_FLIGHT        0
 196 #define IB_ACK_REQUESTED        1
 197
 198 /* Magic WR_ID for ACKs */
 199 #define RDS_IB_ACK_WR_ID        (~(u64) 0)
 200
 201 struct rds_ib_statistics {
 202         uint64_t        s_ib_connect_raced;
 203         uint64_t        s_ib_listen_closed_stale;
 204         uint64_t        s_ib_tx_cq_call;
 205         uint64_t        s_ib_tx_cq_event;
 206         uint64_t        s_ib_tx_ring_full;
 207         uint64_t        s_ib_tx_throttle;
 208         uint64_t        s_ib_tx_sg_mapping_failure;
 209         uint64_t        s_ib_tx_stalled;
 210         uint64_t        s_ib_tx_credit_updates;
 211         uint64_t        s_ib_rx_cq_call;
 212         uint64_t        s_ib_rx_cq_event;
 213         uint64_t        s_ib_rx_ring_empty;
 214         uint64_t        s_ib_rx_refill_from_cq;
 215         uint64_t        s_ib_rx_refill_from_thread;
 216         uint64_t        s_ib_rx_alloc_limit;
 217         uint64_t        s_ib_rx_credit_updates;
 218         uint64_t        s_ib_ack_sent;
 219         uint64_t        s_ib_ack_send_failure;
 220         uint64_t        s_ib_ack_send_delayed;
 221         uint64_t        s_ib_ack_send_piggybacked;
 222         uint64_t        s_ib_ack_received;
 223         uint64_t        s_ib_rdma_mr_alloc;
 224         uint64_t        s_ib_rdma_mr_free;
 225         uint64_t        s_ib_rdma_mr_used;
 226         uint64_t        s_ib_rdma_mr_pool_flush;
 227         uint64_t        s_ib_rdma_mr_pool_wait;
 228         uint64_t        s_ib_rdma_mr_pool_depleted;
 229         uint64_t        s_ib_atomic_cswp;
 230         uint64_t        s_ib_atomic_fadd;
 231 };
 232
 233 extern struct workqueue_struct *rds_ib_wq;
 234
 235 /*
 236  * Fake ib_dma_sync_sg_for_{cpu,device} as long as ib_verbs.h
 237  * doesn't define it.
 238  */
 239 static inline void rds_ib_dma_sync_sg_for_cpu(struct ib_device *dev,
 240                                               struct scatterlist *sglist,
 241                                               unsigned int sg_dma_len,
 242                                               int direction)
 243 {
 244         struct scatterlist *sg;
 245         unsigned int i;
 246
 247         for_each_sg(sglist, sg, sg_dma_len, i) {
 248                 ib_dma_sync_single_for_cpu(dev,
 249                                 ib_sg_dma_address(dev, sg),
 250                                 ib_sg_dma_len(dev, sg),
 251                                 direction);
 252         }
 253 }
 254 #define ib_dma_sync_sg_for_cpu  rds_ib_dma_sync_sg_for_cpu
 255
 256 static inline void rds_ib_dma_sync_sg_for_device(struct ib_device *dev,
 257                                                  struct scatterlist *sglist,
 258                                                  unsigned int sg_dma_len,
 259                                                  int direction)
 260 {
 261         struct scatterlist *sg;
 262         unsigned int i;
 263
 264         for_each_sg(sglist, sg, sg_dma_len, i) {
 265                 ib_dma_sync_single_for_device(dev,
 266                                 ib_sg_dma_address(dev, sg),
 267                                 ib_sg_dma_len(dev, sg),
 268                                 direction);
 269         }
 270 }
 271 #define ib_dma_sync_sg_for_device       rds_ib_dma_sync_sg_for_device
 272
 273
 274 /* ib.c */
 275 extern struct rds_transport rds_ib_transport;
 276 struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device);
 277 void rds_ib_dev_put(struct rds_ib_device *rds_ibdev);
 278 extern struct ib_client rds_ib_client;
 279
 280 extern unsigned int fmr_message_size;
 281 extern unsigned int rds_ib_retry_count;
 282
 283 extern spinlock_t ib_nodev_conns_lock;
 284 extern struct list_head ib_nodev_conns;
 285
 286 /* ib_cm.c */
 287 int rds_ib_conn_alloc(struct rds_connection *conn, gfp_t gfp);
 288 void rds_ib_conn_free(void *arg);
 289 int rds_ib_conn_connect(struct rds_connection *conn);
 290 void rds_ib_conn_shutdown(struct rds_connection *conn);
 291 void rds_ib_state_change(struct sock *sk);
 292 int rds_ib_listen_init(void);
 293 void rds_ib_listen_stop(void);
 294 void __rds_ib_conn_error(struct rds_connection *conn, const char *, ...);
 295 int rds_ib_cm_handle_connect(struct rdma_cm_id *cm_id,
 296                              struct rdma_cm_event *event);
 297 int rds_ib_cm_initiate_connect(struct rdma_cm_id *cm_id);
 298 void rds_ib_cm_connect_complete(struct rds_connection *conn,
 299                                 struct rdma_cm_event *event);
 300
 301
 302 #define rds_ib_conn_error(conn, fmt...) \
 303         __rds_ib_conn_error(conn, KERN_WARNING "RDS/IB: " fmt)
 304
 305 /* ib_rdma.c */
 306 int rds_ib_update_ipaddr(struct rds_ib_device *rds_ibdev, __be32 ipaddr);
 307 void rds_ib_add_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 308 void rds_ib_remove_conn(struct rds_ib_device *rds_ibdev, struct rds_connection *conn);
 309 void rds_ib_destroy_nodev_conns(void);
 310 struct rds_ib_mr_pool *rds_ib_create_mr_pool(struct rds_ib_device *);
 311 void rds_ib_get_mr_info(struct rds_ib_device *rds_ibdev, struct rds_info_rdma_connection *iinfo);
 312 void rds_ib_destroy_mr_pool(struct rds_ib_mr_pool *);
 313 void *rds_ib_get_mr(struct scatterlist *sg, unsigned long nents,
 314                     struct rds_sock *rs, u32 *key_ret);
 315 void rds_ib_sync_mr(void *trans_private, int dir);
 316 void rds_ib_free_mr(void *trans_private, int invalidate);
 317 void rds_ib_flush_mrs(void);
 318 int rds_ib_fmr_init(void);
 319 void rds_ib_fmr_exit(void);
 320
 321 /* ib_recv.c */
 322 int rds_ib_recv_init(void);
 323 void rds_ib_recv_exit(void);
 324 int rds_ib_recv(struct rds_connection *conn);
 325 int rds_ib_recv_alloc_caches(struct rds_ib_connection *ic);
 326 void rds_ib_recv_free_caches(struct rds_ib_connection *ic);
 327 void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp);
 328 void rds_ib_inc_free(struct rds_incoming *inc);
 329 int rds_ib_inc_copy_to_user(struct rds_incoming *inc, struct iov_iter *to);
 330 void rds_ib_recv_cq_comp_handler(struct ib_cq *cq, void *context);
 331 void rds_ib_recv_tasklet_fn(unsigned long data);
 332 void rds_ib_recv_init_ring(struct rds_ib_connection *ic);
 333 void rds_ib_recv_clear_ring(struct rds_ib_connection *ic);
 334 void rds_ib_recv_init_ack(struct rds_ib_connection *ic);
 335 void rds_ib_attempt_ack(struct rds_ib_connection *ic);
 336 void rds_ib_ack_send_complete(struct rds_ib_connection *ic);
 337 u64 rds_ib_piggyb_ack(struct rds_ib_connection *ic);
 338
 339 /* ib_ring.c */
 340 void rds_ib_ring_init(struct rds_ib_work_ring *ring, u32 nr);
 341 void rds_ib_ring_resize(struct rds_ib_work_ring *ring, u32 nr);
 342 u32 rds_ib_ring_alloc(struct rds_ib_work_ring *ring, u32 val, u32 *pos);
 343 void rds_ib_ring_free(struct rds_ib_work_ring *ring, u32 val);
 344 void rds_ib_ring_unalloc(struct rds_ib_work_ring *ring, u32 val);
 345 int rds_ib_ring_empty(struct rds_ib_work_ring *ring);
 346 int rds_ib_ring_low(struct rds_ib_work_ring *ring);
 347 u32 rds_ib_ring_oldest(struct rds_ib_work_ring *ring);
 348 u32 rds_ib_ring_completed(struct rds_ib_work_ring *ring, u32 wr_id, u32 oldest);
 349 extern wait_queue_head_t rds_ib_ring_empty_wait;
 350
 351 /* ib_send.c */
 352 void rds_ib_xmit_complete(struct rds_connection *conn);
 353 int rds_ib_xmit(struct rds_connection *conn, struct rds_message *rm,
 354                 unsigned int hdr_off, unsigned int sg, unsigned int off);
 355 void rds_ib_send_cq_comp_handler(struct ib_cq *cq, void *context);
 356 void rds_ib_send_init_ring(struct rds_ib_connection *ic);
 357 void rds_ib_send_clear_ring(struct rds_ib_connection *ic);
 358 int rds_ib_xmit_rdma(struct rds_connection *conn, struct rm_rdma_op *op);
 359 void rds_ib_send_add_credits(struct rds_connection *conn, unsigned int credits);
 360 void rds_ib_advertise_credits(struct rds_connection *conn, unsigned int posted);
 361 int rds_ib_send_grab_credits(struct rds_ib_connection *ic, u32 wanted,
 362                              u32 *adv_credits, int need_posted, int max_posted);
 363 int rds_ib_xmit_atomic(struct rds_connection *conn, struct rm_atomic_op *op);
 364
 365 /* ib_stats.c */
 366 DECLARE_PER_CPU(struct rds_ib_statistics, rds_ib_stats);
 367 #define rds_ib_stats_inc(member) rds_stats_inc_which(rds_ib_stats, member)
 368 unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
 369                                     unsigned int avail);
 370
 371 /* ib_sysctl.c */
 372 int rds_ib_sysctl_init(void);
 373 void rds_ib_sysctl_exit(void);
 374 extern unsigned long rds_ib_sysctl_max_send_wr;
 375 extern unsigned long rds_ib_sysctl_max_recv_wr;
 376 extern unsigned long rds_ib_sysctl_max_unsig_wrs;
 377 extern unsigned long rds_ib_sysctl_max_unsig_bytes;
 378 extern unsigned long rds_ib_sysctl_max_recv_allocation;
 379 extern unsigned int rds_ib_sysctl_flow_control;
 380
 381 #endif